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United States Patent | 6,121,939 |
Imaizumi ,   et al. | September 19, 2000 |
When a converter 14 is rotated via a rotation mechanism 17, the arrangement inclination angle of two primary radiators 15a and 15b can be adjusted in the range of 0 to 20 deg. with respect to an axis which is in parallel with the ground. Also the reception polarization angle due to probes of the primary radiators 15a and 15b can be adjusted in the range of 0 to 20 deg. while maintaining a preset difference in polarization angle among the satellites. Therefore, the arrangement inclination angle of the primary radiators 15a and 15b for respectively receiving signals from the two satellites, and the reception polarization angle in the primary radiators 15a and 15b can be simultaneously easily adjusted by rotating the converter 14 via the rotation mechanism 17.
Inventors: | Imaizumi; Hiroaki (Omiya, JP); Sakauchi; Koji (Omiya, JP); Hagiwara; Shuji (Omiya, JP); Higuchi; Hirofumi (Omiya, JP); Manabe; Ryotaro (Omiya, JP) |
Assignee: | Yagi Antenna Co., Ltd. (Tokyo, JP) |
Appl. No.: | 961767 |
Filed: | October 31, 1997 |
Nov 15, 1996[JP] | 8-304791 | |
Dec 03, 1996[JP] | 8-322974 | |
Dec 09, 1996[JP] | 8-328295 |
Current U.S. Class: | 343/840; 343/756; 343/781R |
Intern'l Class: | H01Q 013/00 |
Field of Search: | 343/840,756,772,786,781 R,781 CA,911 R,911 L |
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4574289 | Mar., 1986 | Henderson | 343/786. |
4806945 | Feb., 1989 | Cormier et al. | 343/756. |
5043683 | Aug., 1991 | Howard | 333/21. |
5229736 | Jul., 1993 | Adams et al. | 333/21. |
5426442 | Jun., 1995 | Haas | 343/778. |
5434586 | Jul., 1995 | Kinoshita | 343/840. |
5440279 | Aug., 1995 | Kinoshita | 333/26. |
5444455 | Aug., 1995 | Louzir et al. | 343/895. |
5463358 | Oct., 1995 | Dunn et al. | 333/1. |
5696519 | Dec., 1997 | Suzuki et al. | 343/761. |
5812096 | Oct., 1995 | Tilford | 343/781. |
5825333 | Oct., 1998 | Kudoh | 343/781. |
Foreign Patent Documents | |||
2 745 661 | Sep., 1997 | FR | . |
WO 95/06963 | Mar., 1995 | WO | . |
WO 96/02953 | Feb., 1996 | WO | . |